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2018/06/20 (Wednesday)

Previous Day

overnight: Tower temp, 1K pot steady
0917 Tower/MC/Coldplate = 40.6/38.8/182 mK, Still = 1.1 K / 0.055 mbar / 1 mW, G1/G2 = 267/247 mbar, 1K Pot = 1.48 K / 5.0 mbar. MB = 71.5%
0940 Fill LN2 cold trap full.
0947 Begin cooling power test. Optimal base temp has been with Still heater at 1 mW, so we'll leave it as such.
0948 MC heater = 5 uW. Temp rising
1022 MC = 64 mK and rising slowly
1034 Temps are kind of flattening out. MC = 65.6 mK, Tower = 68.2 mK. We don't have all day, so let's get on with it.
1038 MC heater = 10 uW. Temp rising
1108 Temps starting to flatten out, MC = 104.5 mK, Tower = 105.6
1110 MC heater = 15 uW. Temp rising
1145 Temps starting to flatten out, MC = 124.2 mK, Tower = 125.1 mK
1147 MC heater = 20 uW. Temp rising
1207 Temps starting to flatten out, MC = 132.0 mK, Tower = 125.1 mK
1208 MC heater = 30 uW. Temp rising
1248 Temps starting to flatten out, MC = 169.0 mK, Tower = 169.3 mK
1251 MC heater = 40 uW. Temp rising
1216 Temps starting to flatten out, MC = 189.2 mK, Tower = 190.2 mK
1322 MC heater = 60 uW. Temp rising
1358 Temps starting to flatten out, MC = 266.2 mK, Tower = 277.2 mK. Circulation pressures and 1K pot remained the same throughout this test.
1401 MC heater = 0 uW. Temp falling
MC heater power (uW) MC temperature (mK) Tower temperature (mK) Total time at this power (min)
0 38.8 40.5 >1000
5 65.6 68.2 50
10 104.5 105.6 30
15 124.2 125.1 35
20 132.0 132.4 20
30 169.0 169.3 40
40 189.2 190.2 25
60 266.2 277.2 36
Comparison of recent cooling power curves. 2015 curve is without a tower.
1643 Fill LN2 cold trap full.

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